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1999 Fiscal Year Final Research Report Summary

Test of QCD from measurement of the lifetime ofπィイD1+ィエD1πィイD1-ィエD1 atoms using a fast topological trigger system

Research Project

Project/Area Number 09440112
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

KOBAYASHI Masaaki  Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Professor, 素粒子原子核研究所, 教授 (40013388)

Co-Investigator(Kenkyū-buntansha) TAKEUTCHI Fujio  Kyoto Sangyo University, Faculty of Science, Professor, 理学部, 教授 (40121537)
SHINO Kazuo  Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Research Associate, 素粒子原子核研究所, 助手 (20092231)
YOSHIMURA Yoshio  Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Professor, 素粒子原子核研究所, 教授 (50013397)
CHIBA Masami  Tokyo Metropolitan University, Physics Department, Research Associate, 理学部, 助手 (60128577)
Project Period (FY) 1997 – 1999
KeywordsπィイD1+ィエD1πィイD1-ィエD1 Atoms / Scifi detectors / Si-Strip detectors / dE / dx detectors / CHPT / Low-noise fast preamp / Test of QCD
Research Abstract

Test of the quantum chromodynamics (QCD) is important in order to discover and phenomena beyond the standard model of elementary particle physics. Although QCD is known to hold pretty well at high energies, test of QCD at low energies is not easy since calculation has to be carried out without using perturbative method due to the large coupling constant in Lagrangian. We have planned an experiment, called DIRAC, of measuring the decay lifetime of πィイD1+ィエD1πィイD1-ィエD1 atoms to πィイD10ィエD1πィイD10ィエD1 at CERN PS to test the predictions of CHPT, the effective theory of QCD at low energies, to an accuracy of 5%, and started data-taking in 1999. In this experiment, it is important to detect precisely two minimum-ionising particles at short distances (<5-6 mm) within 100 ns after the occurrence of the event. We developed necessary fast Scifi and dE/dx detectors for position and dE/dx measurements, respectively. While we detect πィイD1+ィエD1πィイD1-ィエD1 pairs coming from dissociation of πィイD1+ィエD1πィイD1-ィエD1 atoms in DIRAC, direct detection of decay πィイD10ィエD1πィイD10ィエD1 should have a merit for improved experiment in future. So, we also carried out R&D for fast, heavy and radiation-hard scintillators for excellent g-ray detectors.
1. Scifi-detectors and fast triggering electronics were successfully constructed and are now in use.
2. We have succeeded in developing (1) Si-detectors (64x64mmィイD12ィエD1 in size, 300μm thick and read-out at a step of 1-2mm), (2) charge preamplifier with decay time of 100-240 ns and ENC of 3000e, and (3) shaping amplifier of gain 50 and pulse width of 50 ns. This will replace the present dE/dx detectors of plastic-scintillato strips from 2001.
We have made significant improvement in heavy, fas and radiation hard scintillators such as PbWOィイD24ィエD2, GdィイD22ィエD2SiOィイD25ィエD2:Ce, etc.

  • Research Products

    (48 results)

All Other

All Publications (48 results)

  • [Publications] S. Baccaro: "Influence of La^<3+>-doping on radiation hardness and thermoluminescence characteristics of PbWO_4"Phys. Stat. Sol.. (a)160. R5 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Kobayashi: "Improvement in transmission and decay time of PbWO_4 scintillating crystals by La-doping"Nucl. Instr. Meth.. A399. 261-268 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Kobayashi: "Large-size bismuth silicate(Bi_4Si_3O_<12>)scintillating crystals of good quality"Nucl. Instr. Meth.. A400. 392-400 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Polak: "The blue luminescence of PbWO_4 single crystals"J. Lum. 72-74. 781-783 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Nikl: "Decay kinetics and thermoluminescence characteristics of PbWO_4 : La"Appl. Phys. Lett.. 71. 3755-3757 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Nikl: "Radiation-induced formation of colour in PbWO_4 single crystals"J. Appl. Phys.. 82. 5758-5762 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S .Baccaro: "Radiation damage and thermoluminescence of Gd-doped PbWO_4"Phys. Stat. Sol.. (a)164. R9 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Kobayashi: "Improvement in radiation hardness of PbWO_4 scintillating crystals by La-doping"Nucl. Instr. Meth.. A404. 149-156 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Yoshimura: "Plastic scintillator produced by the injection-molding technique"Nucl. Instr. Meth.. A406. 435-441 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] V. Agoritsas: "Readout of scintillating fibres using a weak cross-talk position-sensitive photomultiplier"Nucl. Instr. Meth.. A406. 393-402 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] V. Agoritsas: "Development of a scifi detector for fast topological triggers in high-luminosity particle physics experiments"Nucl.Instr.Meth.. A411. 17-30 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nucl. Instr. Meth.: "Scintillation performance of large Ce-doping Gd_2SiO_5(GSO)single crystal"IEEE Trans.. NS-45. 518-521 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Tanaka: "Application of cerium-doped gadolinium silicate Gd_2SiO_5 : Ce Scintillator to calorimeters in high-radiation environment"Nucl. Instr. Meth.. A404. 283-294 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Kobayashi: "Comparison of radiation damage in different PbWO_4 scintillating crystals"Nucl. Instr. Meth.. A406. 442-450 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Hara: "La-doped PbWO_4 scintillating crystals grown in large ingots"Nucl. Instr. Meth.. A414. 325-331 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Gorin: "Preliminary study of a topological trigger device for cosmic-ray detectors"Nucl. Instr. Meth.. A421. 60-68 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Kobayashi: "Significant improvement of PbWO_4 scintillating crystals by doping with trivalent ions"Nucl. Instr. Meth.. A434. 412-423 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Tanji: "Crystal growth of PbWO_4 by vertical Bridgman method"J. Cryst. Growth. 204. 505-511 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Ishii: "Crystal growth of BSO(Bi_4Si_3O_<12>)by vertical Bridgman method"J. Cryst. Growth. 205. 191-195 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Nikl: "Radiation damage processes in wide-gap scintillating crystals;new scintillating materials"Nucl. Phys. (Proc. Suppl). B78. 471-478 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] I. Daito: "Time-resolution of multi-cladding scintillating fiber hodoscope"Nucl. Instr. Meth.. A433. 587-591 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Gorin: "Peak-sensing discriminator for multichannel detectors with cross talk"Nucl. Instr. Meth.. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Kobayashi: "Phosphor Handbook,PartIII, Chapter7-3"Scintillators""CRC, Florida. (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石井満: "人工結晶と先端デバイス技術、4.5章「シンチレーション結晶の展開」"三共出版. (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Baccaro et al.: "Influence of LaィイD13+ィエD1 -doping on radiation hardness and thermoluminescence characteristics of PbWOィイD24ィエD2"Phys. Stat. Sol.. (a)160. R5 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kobayashi et al.: "Improvement in transmission and decay time of PbWOィイD24ィエD2 scintillating crystals by La-doping"Nucl. Instr. Meth.. A399. 261-268 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kobayashi et al.: "Large-size bismuth silicate (BiィイD24ィエD2SiィイD23ィエD2OィイD212ィエD2) scintillating crystals of good quality"Nucl. Instr. Meth.. A400. 392-400 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Polak et al.: "The blue luminescence of PbWOィイD24ィエD2 single crystals"J. Lum.. 72-74. 781-783 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nikl et al.: "Decay kinetics and thermoluminescence characteristics of PbWOィイD24ィエD2:La"Appl. Phys. Lett.. 71. 3755-3757 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nikl et al.: "Radiation-induced formation of colou rcentres in PbWOィイD24ィエD2 single crystals"J. Appl. Phys.. 82. 5758-5762 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Baccaro et al.: "Radiation damage and thermoluminescence of Gd-doped PbWOィイD24ィエD2"Phys. Stat. Sol.. (a)164. R9 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kobayashi et al.: "Improvement in radiation hardness of PbWOィイD24ィエD2 scintillating crystals by La-doping"Nucl, Instr. Meth.. A404. 149-156 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Yoshimura et al.: "Plastic scintillator produced by the injection-molding technique"Nucl. Instr. Meth.. A406. 435-441 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] V.Agoritsas et al.: "Readout of scintillating fibres using a weak cross-talk position-sensitive photomultiplier"Nucl. Instr. Meth.. A406. 393-402 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] V.Agoritsas et al.: "Development of a scifi detector for fast topological triggers in high-luminosity particle physics experiments"Nucl. Instr. Meth.. A411. 17-30 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Ishibashi et al.: "Scintillation performance of large Ce-doped GdィイD22ィエD2SiOィイD15ィエD1(GSO) single crystal"IEEE Trans.. NS-45. 518-521 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Tanaka et al.: "Application of cerium-doped gadolinium silicate GSO:Ce scintillator to calorimeters in high-radiation environment"Nucl. Instr. Meth.. A404. 283-294 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kobayashi et al.: "Comparison of radiation damage in different PbWOィイD24ィエD2 scintillating crystals."Nucl. Instr. Meth.. A406. 442-450 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hara et al.: "La-doped PbWOィイD24ィエD2 scintillating crystals grown in large ingots"Nucl. Instr. Meth.. A414. 325-331 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Gorin et al.: "Preliminary study of a topological trigger device for cosmic-ray detectors,"Nucl. Instr. Meth.. A421. 60-68 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kobayashi et al.: "Significant improvement of PbWOィイD24ィエD2 scintillating crystals by doping with trivalent ions"Nucl. Instr. Meth.. A434. 412-423 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tanji et al.: "Crystal growth of PbWOィイD24ィエD2 by vertical Bridgman method"J. Cryst. Growth. 204. 505-511 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ishii et al.: "Crystal Growth of BSO (BiィイD24ィエD2SiィイD23ィエD2OィイD212ィエD2) by vertical Bridgman method"J. Cryst. Growth. 205. 191-195 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nikl et al.: "Radiation damage processes in wide-gap scintillating crystals ; new scintillating materials"Nucl. Phys. (Proc. Suppl.). B78. 471-478 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I.Daito et al.: "Time-resolution of multi-cladding scintillating fiber horoscope"Nucl. Instr. Meth.. A433. 587-591 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Gorin et al.: "Peak-sensing discriminator for multichannel detectors with cross talk"Nucl. Instr. Meth.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kobayashi and M.Ishii: "Scintillators, Phosphor Handbook"eds. S. Shionoya and W.M. Yen (CRC, Florida, 1998), Part III, Chapter 7-3. 539-548

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ishii and M.Kobayashi: "Development of scintillators, Artificical Crystals and High-technology for Devices"ed. Association of Synthetic Crystal Science and Technology (Sankyo-Shuppan, 1998), Chapter 4.5 (in Japanese). 153-164

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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